Transformer and armature-core



UNITED STATES 'PATENT OFFICE.

CARIJ I1. KAMMEYER, on EAU CLAIRE, WISCONSIN.

TRANSFORM ER AND ARMATURE-CORE.

SPECIFICATION forming part of Letters Patent NO. 464,026, dated December1, 1891.

Application filed May '7, 1891. Serial No. 391,920. (No model.)

To all whom t 1v1/tty concern:

Be it known that I, CARIJ E, KAMMEYER, a citizen of the United States,residing at Eau Claire, in the county of Eau Claire and State ofWisconsin, have invented a new and useful Improvement in Transformersand Armature-Cores, of which the following is a full, clear, and exactspecification.

My invention relates to the construction of magnetic cores for armaturesfor transformers, converters, dynamoelectric machines, and the like,more particularly such cores as are composed of laminated iron, plates,disks, or strips of magnetic material; and its object is to provide asimple and convenient armature and in which there shall be the leastpossible Waste on account of heat.

My invention is illustrated in the accompanying drawings, wherein thesame is shown as applied to the armature-core of adynamoelectric machineand to the strips of iron or other metallic material of which the coreofa transformer or induction-coil may be made.

Figure l is a cross-section through the armature-core. Fig. 2 is adetail view of one of the plates. Fig. 3 is a detail view of the platesfrom which a transformer-core can be made.

Like parts are indicated by same letters in all figures.

A is a shaft carrying an insulated sleeve or bushing B of paper orpaper-wood fiber or other suitable material.

C C are two iron flanges serving to hold the plates or disks D D D inposition. Both the iianges C C aswell as the disks or plates D D D, arecoated on one or both sides With the insulating-varnish or othersuitable composition, as described. I have shown such coating by meansof the heavy black lines E E E. The same letters apply to Fig. 3, themagnetic strips or plates being shown at D the flexible insulatingcoating being indicated by E.

The use and operation of my invention are as follows: Heretofore it hasbeen and still is the practice to separate such plates, disks, or

Y strips by means of insulating-disks of paper,

less defective and inadequate to accomplish the desired end. By usingpaper or other similar insulation the same is apt to char or becomecarbonized from any long-continued heatingof the magnetic core ofthetransformer or armature. The use of shellac or other Varnishes whichbecome hard in drying is also objectionable because the varnish is aptto scale. off or blister, leaving parts of the iron surfaces exposed.The difficulty last nientioned is especially encountered in themanipulation of the plates when prepared and in their application in thebuilding up of the armature. These armatures are very solidly built, theplates being forced together under great pressure. Lateral movement ofthe plates one upon the other or slight bending, such as results fromsuch manipulation, and, perhaps especially in the construction oftransformers, very often carries away or tears ott' the comparativelyunyielding ordinary insulations. In my invention I apply a coating ofvarnish to the surface intended to be insulated, such varnish having theproperty of retaining its toughness and flexibility after having becomedry on the surface to which it was applied. In other words, I coat theplates of which such armatures are made with a thin flexibleinsulating-varnish or other liquid. This liquid is applied to one orboth sides of the plates, and when dried is still yielding and iieXible,so as not to easily come off from abrasion or break off when the plate-is bent or struck.

The insulating-varnish used in carrying out my invention may be made ina number of ways, the essential points being that the varnish or coatingis a good insulator, and retains sufficient flexibility after drying topermit the handling, bending, dre., which the magnetic plates or barsmay be subjected to in assembling.

I have used the following formula:

No. l.-vGutt-a pei-cha, one part; oil of turpentine, fivel parts; hotlinseed-oil, eight parts. Dissolve the gutta-percha in the tur- IOOboiled linseed-oil, eight ounces. Dissolve the ly-tlexibleinsulating-coats of Varnish or the gutta-peroha in the turpentine andthe resin like applied permanently to the plates, which in the oil, thenadd one mixture to the other are then built together to form such core.

under constant stirring. CARL E. KAMMEYER. 5 I claim- Vitnesses:

An armature-core consisting of a series of W. EMMERsoN SMITH, plates,said plates provided with permanent- A. IRVINE.

